B3b Diffusion Answer

B3b Diffusion Answer Sheet

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  • Created on: 02-05-12 09:13
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B3b Diffusion
1. The diffusion is the net movement of particles from an area of higher concentration
to an area of lower concentration. It is a natural process.
2. Enzymes control and catalyse many chemical reactions in living things. Which of
the following process that is not controlled by enzymes.
Protein synthesis / photosynthesis / diffusion / respiration
3. Substances such as oxygen can enter and leave cells by diffusion.
Look at the diagrams of five cells.
The dots show the concentration of oxygen.
Which diagram shows the diffusion of oxygen?
Choose A, B, C, D or E.
Higher only:
4. The diagrams show air sacs from the lungs of three different people.

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What is the scientific name for the air sacs in lungs?
(ii) 1 His alveoli has more surface area than John or Alan
2 His alveoli has more blood capillaries so higher chance of diffusion…read more


lisa linsdell

Answers to exam style questions that are set in a separate document. Higher questions clearly identified.


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@lisalindsell you really get around huh?

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